On chip temperature sensor driver. The driver monitors the temperature of the MPU subsystem of the OMAP4. It sends notifications to the user space if the temperature crosses user defined thresholds via kobject_uevent interface. The user is allowed to configure the temperature thresholds vis sysfs nodes exposed using hwmon interface. Signed-off-by: Keerthy <j-keerthy@xxxxxx> Cc: Jean Delvare <khali@xxxxxxxxxxxx> Cc: Guenter Roeck <guenter.roeck@xxxxxxxxxxxx> Cc: lm-sensors@xxxxxxxxxxxxxx --- Documentation/hwmon/omap_temp_sensor | 26 + drivers/hwmon/Kconfig | 11 + drivers/hwmon/Makefile | 1 + drivers/hwmon/omap_temp_sensor.c | 881 ++++++++++++++++++++++++++++++++++ 4 files changed, 919 insertions(+), 0 deletions(-) create mode 100644 Documentation/hwmon/omap_temp_sensor create mode 100644 drivers/hwmon/omap_temp_sensor.c diff --git a/Documentation/hwmon/omap_temp_sensor b/Documentation/hwmon/omap_temp_sensor new file mode 100644 index 0000000..357f09a --- /dev/null +++ b/Documentation/hwmon/omap_temp_sensor @@ -0,0 +1,26 @@ +Kernel driver omap_temp_sensor +============================== + +Supported chips: + * Texas Instruments OMAP4460 + Prefix: 'omap_temp_sensor' + +Author: + J Keerthy <j-keerthy@xxxxxx> + +Description +----------- + +The Texas Instruments OMAP4 family of chips have a bandgap temperature sensor. +The temperature sensor feature is used to convert the temperature of the device +into a decimal value coded on 10 bits. An internal ADC is used for conversion. +The recommended operating temperatures must be in the range -40 degree Celsius +to 123 degree celsius for standard conversion. +The thresholds are programmable and upon crossing the thresholds an interrupt +is generated. The OMAP temperature sensor has a programmable update rate in +milli seconds. +(Currently the driver programs a default of 2000 milliseconds). + +The driver provides the common sysfs-interface for temperatures (see +Documentation/hwmon/sysfs-interface under Temperatures). + diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig index 5f888f7..9c9cd8b 100644 --- a/drivers/hwmon/Kconfig +++ b/drivers/hwmon/Kconfig @@ -323,6 +323,17 @@ config SENSORS_F71805F This driver can also be built as a module. If so, the module will be called f71805f. +config SENSORS_OMAP_BANDGAP_TEMP_SENSOR + bool "OMAP on-die temperature sensor hwmon driver" + depends on HWMON && ARCH_OMAP && OMAP_TEMP_SENSOR + help + If you say yes here you get support for hardware + monitoring features of the OMAP on die temperature + sensor. + + Continuous conversion programmable delay + mode is used for temperature conversion. + config SENSORS_F71882FG tristate "Fintek F71882FG and compatibles" help diff --git a/drivers/hwmon/Makefile b/drivers/hwmon/Makefile index 28061cf..d0f89f5 100644 --- a/drivers/hwmon/Makefile +++ b/drivers/hwmon/Makefile @@ -91,6 +91,7 @@ obj-$(CONFIG_SENSORS_MAX6639) += max6639.o obj-$(CONFIG_SENSORS_MAX6642) += max6642.o obj-$(CONFIG_SENSORS_MAX6650) += max6650.o obj-$(CONFIG_SENSORS_MC13783_ADC)+= mc13783-adc.o +obj-$(CONFIG_SENSORS_OMAP_BANDGAP_TEMP_SENSOR) += omap_temp_sensor.o obj-$(CONFIG_SENSORS_PC87360) += pc87360.o obj-$(CONFIG_SENSORS_PC87427) += pc87427.o obj-$(CONFIG_SENSORS_PCF8591) += pcf8591.o diff --git a/drivers/hwmon/omap_temp_sensor.c b/drivers/hwmon/omap_temp_sensor.c new file mode 100644 index 0000000..67fa424 --- /dev/null +++ b/drivers/hwmon/omap_temp_sensor.c @@ -0,0 +1,881 @@ +/* + * OMAP4 Temperature sensor driver file + * + * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com/ + * Author: J Keerthy <j-keerthy@xxxxxx> + * Author: Moiz Sonasath <m-sonasath@xxxxxx> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301 USA + * + */ + +#include <linux/interrupt.h> +#include <linux/clk.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/init.h> +#include <plat/omap_device.h> +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/jiffies.h> +#include <linux/hwmon.h> +#include <linux/hwmon-sysfs.h> +#include <linux/stddef.h> +#include <linux/sysfs.h> +#include <linux/err.h> +#include <linux/types.h> +#include <linux/mutex.h> +#include <linux/pm_runtime.h> +#include <linux/delay.h> +#include <plat/temperature_sensor.h> + +#define TSHUT_HOT 920 /* 122 deg C */ +#define TSHUT_COLD 866 /* 100 deg C */ +#define T_HOT 800 /* 73 deg C */ +#define T_COLD 795 /* 71 deg C */ +#define OMAP_ADC_START_VALUE 530 +#define OMAP_ADC_END_VALUE 923 +#define MAX_FREQ 2000000 +#define MIN_FREQ 1000000 +#define MIN_TEMP -40000 +#define MAX_TEMP 123000 +#define HYST_VAL 5000 +#define NEG_HYST_VAL -5000 +/* + * omap_temp_sensor structure + * @hwmon_dev - hwmon device pointer + * @pdev_dev - platform device pointer + * @clock - Clock pointer + * @registers - Pointer to structure with register offsets and bitfields + * @sensor_mutex - Mutex for sysfs, irq and PM + * @irq - MPU Irq number for thermal alert + * @phy_base - Physical base of the temp I/O + * @clk_rate - Holds current clock rate + * @temp_sensor_ctrl - temp sensor control register value + * @bg_ctrl - bandgap ctrl register value + * @bg_counter - bandgap counter value + * @bg_threshold - bandgap threshold register value + * @temp_sensor_tshut_threshold - bandgap tshut register value + * @clk_on - Manages the current clock state + */ +struct omap_temp_sensor { + struct device *hwmon_dev; + struct device *pdev_dev; + struct clk *clock; + struct omap_temp_sensor_registers *registers; + struct mutex sensor_mutex; /* Mutex for sysfs, irq and PM */ + unsigned int irq; + void __iomem *phy_base; + u32 clk_rate; + u32 temp_sensor_ctrl; + u32 bg_ctrl; + u32 bg_counter; + u32 bg_threshold; + u32 temp_sensor_tshut_threshold; + bool clk_on; +}; + +/* + * Temperature values in milli degree celsius + * ADC code values from 530 to 923 + */ +static int adc_to_temp[394] = { + -40000, -40000, -40000, -40000, -39800, -39400, -39000, -38600, -38200, + -37800, -37300, -36800, -36400, -36000, -35600, -35200, -34800, + -34300, -33800, -33400, -33000, -32600, -32200, -31800, -31300, + -30800, -30400, -30000, -29600, -29200, -28700, -28200, -27800, + -27400, -27000, -26600, -26200, -25700, -25200, -24800, -24400, + -24000, -23600, -23200, -22700, -22200, -21800, -21400, -21000, + -20600, -20200, -19700, -19200, -18800, -18400, -18000, -17600, + -17200, -16700, -16200, -15800, -15400, -15000, -14600, -14200, + -13700, -13200, -12800, -12400, -12000, -11600, -11200, -10700, + -10200, -9800, -9400, -9000, -8600, -8200, -7700, -7200, -6800, + -6400, -6000, -5600, -5200, -4800, -4300, -3800, -3400, -3000, + -2600, -2200, -1800, -1300, -800, -400, 0, 400, 800, 1200, 1600, + 2100, 2600, 3000, 3400, 3800, 4200, 4600, 5100, 5600, 6000, 6400, + 6800, 7200, 7600, 8000, 8500, 9000, 9400, 9800, 10200, 10600, 11000, + 11400, 11900, 12400, 12800, 13200, 13600, 14000, 14400, 14800, + 15300, 15800, 16200, 16600, 17000, 17400, 17800, 18200, 18700, + 19200, 19600, 20000, 20400, 20800, 21200, 21600, 22100, 22600, + 23000, 23400, 23800, 24200, 24600, 25000, 25400, 25900, 26400, + 26800, 27200, 27600, 28000, 28400, 28800, 29300, 29800, 30200, + 30600, 31000, 31400, 31800, 32200, 32600, 33100, 33600, 34000, + 34400, 34800, 35200, 35600, 36000, 36400, 36800, 37300, 37800, + 38200, 38600, 39000, 39400, 39800, 40200, 40600, 41100, 41600, + 42000, 42400, 42800, 43200, 43600, 44000, 44400, 44800, 45300, + 45800, 46200, 46600, 47000, 47400, 47800, 48200, 48600, 49000, + 49500, 50000, 50400, 50800, 51200, 51600, 52000, 52400, 52800, + 53200, 53700, 54200, 54600, 55000, 55400, 55800, 56200, 56600, + 57000, 57400, 57800, 58200, 58700, 59200, 59600, 60000, 60400, + 60800, 61200, 61600, 62000, 62400, 62800, 63300, 63800, 64200, + 64600, 65000, 65400, 65800, 66200, 66600, 67000, 67400, 67800, + 68200, 68700, 69200, 69600, 70000, 70400, 70800, 71200, 71600, + 72000, 72400, 72800, 73200, 73600, 74100, 74600, 75000, 75400, + 75800, 76200, 76600, 77000, 77400, 77800, 78200, 78600, 79000, + 79400, 79800, 80300, 80800, 81200, 81600, 82000, 82400, 82800, + 83200, 83600, 84000, 84400, 84800, 85200, 85600, 86000, 86400, + 86800, 87300, 87800, 88200, 88600, 89000, 89400, 89800, 90200, + 90600, 91000, 91400, 91800, 92200, 92600, 93000, 93400, 93800, + 94200, 94600, 95000, 95500, 96000, 96400, 96800, 97200, 97600, + 98000, 98400, 98800, 99200, 99600, 100000, 100400, 100800, 101200, + 101600, 102000, 102400, 102800, 103200, 103600, 104000, 104400, + 104800, 105200, 105600, 106100, 106600, 107000, 107400, 107800, + 108200, 108600, 109000, 109400, 109800, 110200, 110600, 111000, + 111400, 111800, 112200, 112600, 113000, 113400, 113800, 114200, + 114600, 115000, 115400, 115800, 116200, 116600, 117000, 117400, + 117800, 118200, 118600, 119000, 119400, 119800, 120200, 120600, + 121000, 121400, 121800, 122200, 122600, 123000 +}; + +static unsigned long omap_temp_sensor_readl(struct omap_temp_sensor + *temp_sensor, u32 reg) +{ + return __raw_readl(temp_sensor->phy_base + reg); +} + +static void omap_temp_sensor_writel(struct omap_temp_sensor *temp_sensor, + u32 val, u32 reg) +{ + __raw_writel(val, temp_sensor->phy_base + reg); +} + +static int adc_to_temp_conversion(int adc_val) +{ + return adc_to_temp[adc_val - OMAP_ADC_START_VALUE]; +} + +static int temp_to_adc_conversion(long temp) +{ + int high, low, mid; + + if (temp < adc_to_temp[0] || + temp > adc_to_temp[OMAP_ADC_END_VALUE - OMAP_ADC_START_VALUE]) + return -EINVAL; + + high = OMAP_ADC_END_VALUE - OMAP_ADC_START_VALUE; + low = 0; + mid = (high + low) / 2; + + while (low < high) { + if (temp < adc_to_temp[mid]) + high = mid - 1; + else + low = mid + 1; + mid = (low + high) / 2; + } + + return OMAP_ADC_START_VALUE + low; +} + +static void omap_configure_temp_sensor_counter(struct omap_temp_sensor + *temp_sensor, u32 counter) +{ + u32 val; + + val = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_counter); + val &= ~temp_sensor->registers->counter_mask; + val |= counter << __ffs(temp_sensor->registers->counter_mask); + omap_temp_sensor_writel(temp_sensor, val, + temp_sensor->registers->bgap_counter); +} + +static void omap_enable_continuous_mode(struct omap_temp_sensor *temp_sensor) +{ + u32 val; + + val = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_mode_ctrl); + + val |= 1 << __ffs(temp_sensor->registers->mode_ctrl_mask); + + omap_temp_sensor_writel(temp_sensor, val, + temp_sensor->registers->bgap_mode_ctrl); +} + +static void omap_temp_sensor_unmask_interrupts(struct omap_temp_sensor + *temp_sensor, u8 hot, u8 cold) +{ + u32 reg_val; + + reg_val = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_mask_ctrl); + if (hot) + reg_val |= temp_sensor->registers->mask_hot_mask; + else + reg_val &= ~temp_sensor->registers->mask_hot_mask; + + if (cold) + reg_val |= temp_sensor->registers->mask_cold_mask; + else + reg_val &= ~temp_sensor->registers->mask_cold_mask; + + omap_temp_sensor_writel(temp_sensor, reg_val, + temp_sensor->registers->bgap_mask_ctrl); +} + +static void add_hyst(int adc_val, int hyst_val, int *thresh_val) +{ + int temp = adc_to_temp_conversion(adc_val); + + temp += hyst_val; + + *thresh_val = temp_to_adc_conversion(temp); +} + +static void omap_temp_sensor_configure_thresholds_mask(struct omap_temp_sensor + *temp_sensor, bool set_hot, bool set_cold, int t_hot, int t_cold) +{ + int reg_val, cold, hot, temp; + + if (set_hot) { + /* obtain the T cold value */ + cold = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_threshold); + cold = (cold & temp_sensor->registers->threshold_tcold_mask) + >> __ffs(temp_sensor->registers->threshold_tcold_mask); + + if (t_hot < cold) { + /* change the t_cold to t_hot - 5000 millidegrees */ + add_hyst(t_hot, NEG_HYST_VAL, &cold); + /* write the new t_cold value */ + reg_val = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_threshold); + reg_val &= + ~temp_sensor->registers->threshold_tcold_mask; + reg_val |= cold << + __ffs(temp_sensor->registers->threshold_tcold_mask); + omap_temp_sensor_writel(temp_sensor, reg_val, + temp_sensor->registers->bgap_threshold); + t_cold = cold; + } + + /* write the new t_hot value */ + reg_val = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_threshold); + reg_val &= ~temp_sensor->registers->threshold_thot_mask; + reg_val |= (t_hot << + __ffs(temp_sensor->registers->threshold_thot_mask)); + omap_temp_sensor_writel(temp_sensor, reg_val, + temp_sensor->registers->bgap_threshold); + } + + if (set_cold) { + /* obtain the T HOT value */ + hot = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_threshold); + hot = (hot & temp_sensor->registers->threshold_thot_mask) >> + __ffs(temp_sensor->registers->threshold_thot_mask); + if (t_cold > hot) { + /* change the t_hot to t_cold + 5000 millidegrees */ + add_hyst(t_cold, HYST_VAL, &hot); + /* write the new t_hot value */ + reg_val = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_threshold); + reg_val &= + ~temp_sensor->registers->threshold_thot_mask; + reg_val |= (hot << + __ffs(temp_sensor->registers->threshold_thot_mask)); + omap_temp_sensor_writel(temp_sensor, reg_val, + temp_sensor->registers->bgap_threshold); + t_hot = hot; + } + + /* write the new t_cold value */ + reg_val = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_threshold); + reg_val &= ~temp_sensor->registers->threshold_tcold_mask; + reg_val |= t_cold << + __ffs(temp_sensor->registers->threshold_tcold_mask); + omap_temp_sensor_writel(temp_sensor, reg_val, + temp_sensor->registers->bgap_threshold); + } + /* obtain the T cold value */ + cold = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_threshold); + cold = (cold & temp_sensor->registers->threshold_tcold_mask) + >> __ffs(temp_sensor->registers->threshold_tcold_mask); + + /* obtain the T HOT value */ + hot = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_threshold); + hot = (hot & temp_sensor->registers->threshold_thot_mask) >> + __ffs(temp_sensor->registers->threshold_thot_mask); + + /* Read the current temperature */ + temp = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->temp_sensor_ctrl); + temp &= temp_sensor->registers->bgap_dtemp_mask; + + /* + * If current temperature is in-between the hot and cold thresholds + * Enable both masks or in the init case enable both masks + */ + if ((temp > cold && temp < hot) || (set_cold && set_hot)) + omap_temp_sensor_unmask_interrupts(temp_sensor, 1, 1); + + /* + * If user sets the HIGH threshold(t_hot) greater than the current + * temperature(temp) unmask the HOT interrupts + */ + else if (hot > temp) + omap_temp_sensor_unmask_interrupts(temp_sensor, 1, 0); + + /* + * If user sets the LOW threshold(t_cold) lower than the current + * temperature(temp) unmask the COLD interrupts + */ + else + omap_temp_sensor_unmask_interrupts(temp_sensor, 0, 1); +} + +/* Sysfs hook functions */ + +static ssize_t show_temp_max(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev); + int temp; + + temp = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_threshold); + temp = (temp & temp_sensor->registers->threshold_thot_mask) + >> __ffs(temp_sensor->registers->threshold_thot_mask); + temp = adc_to_temp_conversion(temp); + + return snprintf(buf, 16, "%d\n", temp); +} + +static ssize_t set_temp_max(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev); + long val; + u32 t_hot; + + if (strict_strtol(buf, 10, &val)) + return -EINVAL; + if (val < MIN_TEMP - HYST_VAL) + return -EINVAL; + + t_hot = temp_to_adc_conversion(val); + if (t_hot < 0) + return t_hot; + + mutex_lock(&temp_sensor->sensor_mutex); + omap_temp_sensor_configure_thresholds_mask(temp_sensor, 1, 0, + t_hot, 0); + mutex_unlock(&temp_sensor->sensor_mutex); + + return count; +} + +static ssize_t show_temp_max_hyst(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev); + u32 temp; + + temp = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_threshold); + temp = (temp & temp_sensor->registers->threshold_tcold_mask) >> + __ffs(temp_sensor->registers->threshold_tcold_mask); + + if (temp < OMAP_ADC_START_VALUE || temp > OMAP_ADC_END_VALUE) { + dev_err(dev, "invalid value\n"); + return -EIO; + } + + temp = adc_to_temp_conversion(temp); + + return snprintf(buf, 16, "%d\n", temp); +} + +static ssize_t set_temp_max_hyst(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev); + u32 t_cold; + long val; + + if (strict_strtol(buf, 10, &val)) { + count = -EINVAL; + goto out; + } + + if (val > MAX_TEMP - HYST_VAL) { + count = -EINVAL; + goto out; + } + + t_cold = temp_to_adc_conversion(val); + if (t_cold < 0) + return t_cold; + + + mutex_lock(&temp_sensor->sensor_mutex); + omap_temp_sensor_configure_thresholds_mask(temp_sensor, 0, 1, 0, + t_cold); + mutex_unlock(&temp_sensor->sensor_mutex); + +out: + return count; +} + +static ssize_t show_update_interval(struct device *dev, + struct device_attribute *devattr, char *buf) +{ + struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev); + u32 temp; + + temp = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_counter); + temp = (temp & temp_sensor->registers->counter_mask) >> + __ffs(temp_sensor->registers->counter_mask); + temp = temp * 1000 / temp_sensor->clk_rate; + + return sprintf(buf, "%d\n", temp); +} + +static ssize_t set_update_interval(struct device *dev, + struct device_attribute *devattr, + const char *buf, size_t count) +{ + struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev); + long val; + + if (strict_strtol(buf, 10, &val)) { + count = -EINVAL; + goto out; + } + + if (val < 0) + return -EINVAL; + val *= temp_sensor->clk_rate / 1000; + mutex_lock(&temp_sensor->sensor_mutex); + omap_configure_temp_sensor_counter(temp_sensor, val); + mutex_unlock(&temp_sensor->sensor_mutex); +out: + return count; +} + +static int omap_temp_sensor_read_temp(struct device *dev, + struct device_attribute *devattr, + char *buf) +{ + struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev); + int temp; + + temp = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->temp_sensor_ctrl); + temp &= temp_sensor->registers->bgap_dtemp_mask; + + /* look up for temperature in the table and return the temperature */ + if (temp < OMAP_ADC_START_VALUE || temp > OMAP_ADC_END_VALUE) + return -EIO; + + temp = adc_to_temp[temp - OMAP_ADC_START_VALUE]; + + return sprintf(buf, "%d\n", temp); +} + +static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, omap_temp_sensor_read_temp, + NULL, 0); +static SENSOR_DEVICE_ATTR(temp1_max, S_IWUSR | S_IRUGO, show_temp_max, + set_temp_max, 0); +static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IWUSR | S_IRUGO, show_temp_max_hyst, + set_temp_max_hyst, 0); +static SENSOR_DEVICE_ATTR(update_interval, S_IWUSR | S_IRUGO, + show_update_interval, set_update_interval, 0); + +static struct attribute *omap_temp_sensor_attributes[] = { + &sensor_dev_attr_temp1_input.dev_attr.attr, + &sensor_dev_attr_temp1_max.dev_attr.attr, + &sensor_dev_attr_temp1_max_hyst.dev_attr.attr, + &sensor_dev_attr_update_interval.dev_attr.attr, + NULL +}; + +static const struct attribute_group omap_temp_sensor_group = { + .attrs = omap_temp_sensor_attributes, +}; + +static int omap_temp_sensor_clk_enable(struct omap_temp_sensor *temp_sensor) +{ + u32 ret = 0; + + if (temp_sensor->clk_on) { + dev_err(temp_sensor->pdev_dev, "clock already on\n"); + goto out; + } + + ret = pm_runtime_get_sync(temp_sensor->pdev_dev); + if (ret < 0) { + dev_err(temp_sensor->pdev_dev, "get sync failed\n"); + goto out; + } + + temp_sensor->clk_on = 1; + +out: + return ret; +} + +static void omap_temp_sensor_clk_disable(struct omap_temp_sensor *temp_sensor) +{ + /* Gate the clock */ + pm_runtime_put_sync(temp_sensor->hwmon_dev); + temp_sensor->clk_on = 0; +} + +static irqreturn_t omap_talert_irq_handler(int irq, void *data) +{ + struct omap_temp_sensor *temp_sensor; + int t_hot, t_cold, temp; + + temp_sensor = data; + mutex_lock(&temp_sensor->sensor_mutex); + /* Read the status of t_hot */ + t_hot = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_status) + & temp_sensor->registers->status_hot_mask; + + /* Read the status of t_cold */ + t_cold = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_status) + & temp_sensor->registers->status_cold_mask; + + temp = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_mask_ctrl); + /* + * One TALERT interrupt: Two sources + * If the interrupt is due to t_hot then mask t_hot and + * and unmask t_cold else mask t_cold and unmask t_hot + */ + if (t_hot) { + temp &= ~temp_sensor->registers->mask_hot_mask; + temp |= temp_sensor->registers->mask_cold_mask; + } else if (t_cold) { + temp &= ~temp_sensor->registers->mask_cold_mask; + temp |= temp_sensor->registers->mask_hot_mask; + } + + omap_temp_sensor_writel(temp_sensor, temp, + temp_sensor->registers->bgap_mask_ctrl); + + if (temp_sensor->hwmon_dev) + /* kobject_uvent to user space telling threshold crossed */ + kobject_uevent(&temp_sensor->hwmon_dev->kobj, KOBJ_CHANGE); + + mutex_unlock(&temp_sensor->sensor_mutex); + + return IRQ_HANDLED; +} + +static int __devinit omap_temp_sensor_probe(struct platform_device *pdev) +{ + struct omap_temp_sensor_pdata *pdata = pdev->dev.platform_data; + struct omap_temp_sensor *temp_sensor; + struct resource *mem; + int ret = 0; + int clk_rate; + u32 max_freq, min_freq; + + if (!pdata) { + dev_err(&pdev->dev, "platform data missing\n"); + return -EINVAL; + } + + temp_sensor = kzalloc(sizeof(*temp_sensor), GFP_KERNEL); + if (!temp_sensor) { + dev_err(&pdev->dev, "Memory allocation failed\n"); + return -ENOMEM; + } + + mutex_init(&temp_sensor->sensor_mutex); + + mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!mem) { + dev_err(&pdev->dev, "no mem resource\n"); + ret = -ENOMEM; + goto plat_res_err; + } + + temp_sensor->irq = platform_get_irq_byname(pdev, "thermal_alert"); + if (temp_sensor->irq < 0) { + dev_err(&pdev->dev, "get_irq_byname failed\n"); + ret = temp_sensor->irq; + goto plat_res_err; + } + + temp_sensor->phy_base = ioremap(mem->start, resource_size(mem)); + if (!temp_sensor->phy_base) { + dev_err(&pdev->dev, "ioremap failed\n"); + ret = -ENOMEM; + goto plat_res_err; + } + + temp_sensor->clock = NULL; + temp_sensor->registers = pdata->registers; + temp_sensor->pdev_dev = &pdev->dev; + + if (pdata->max_freq && pdata->min_freq) { + max_freq = pdata->max_freq; + min_freq = pdata->min_freq; + } else { + max_freq = MAX_FREQ; + min_freq = MIN_FREQ; + } + + pm_runtime_enable(&pdev->dev); + pm_runtime_irq_safe(&pdev->dev); + + /* + * check if the efuse has a non-zero value if not + * it is an untrimmed sample and the temperatures + * may not be accurate + */ + + if (omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_efuse)) + dev_info(&pdev->dev, + "Invalid EFUSE, Non-trimmed BGAP, Temp not accurate\n"); + + dev_set_drvdata(&pdev->dev, temp_sensor); + temp_sensor->clock = clk_get(&pdev->dev, "fck"); + if (IS_ERR(temp_sensor->clock)) { + ret = PTR_ERR(temp_sensor->clock); + dev_err(&pdev->dev, + "unable to get fclk: %d\n", ret); + goto plat_res_err; + } + + ret = omap_temp_sensor_clk_enable(temp_sensor); + if (ret) + goto clken_err; + + clk_rate = clk_round_rate(temp_sensor->clock, max_freq); + if (clk_rate < min_freq || clk_rate == 0xffffffff) { + ret = -ENODEV; + goto clken_err; + } + + ret = clk_set_rate(temp_sensor->clock, clk_rate); + if (ret) { + dev_err(&pdev->dev, "Cannot set clock rate\n"); + goto clken_err; + } + + temp_sensor->clk_rate = clk_rate; + omap_enable_continuous_mode(temp_sensor); + /* 1 clk cycle */ + omap_configure_temp_sensor_counter(temp_sensor, 1); + + /* Wait till the first conversion is done wait for at least 1ms */ + usleep_range(1000, 2000); + + /* Read the temperature once due to hw issue*/ + omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->temp_sensor_ctrl); + + /* Set 2 seconds time as default counter */ + omap_configure_temp_sensor_counter(temp_sensor, + temp_sensor->clk_rate * 2); + + ret = request_threaded_irq(temp_sensor->irq, NULL, + omap_talert_irq_handler, IRQF_TRIGGER_RISING | IRQF_ONESHOT, + "temp_sensor", temp_sensor); + if (ret) { + dev_err(&pdev->dev, "Request threaded irq failed.\n"); + goto req_irq_err; + } + + ret = sysfs_create_group(&pdev->dev.kobj, &omap_temp_sensor_group); + if (ret) { + dev_err(&pdev->dev, "could not create sysfs files\n"); + goto sysfs_create_err; + } + + temp_sensor->hwmon_dev = hwmon_device_register(&pdev->dev); + if (IS_ERR(temp_sensor->hwmon_dev)) { + dev_err(&pdev->dev, "hwmon_device_register failed.\n"); + ret = PTR_ERR(temp_sensor->hwmon_dev); + goto hwmon_reg_err; + } + + mutex_lock(&temp_sensor->sensor_mutex); + omap_temp_sensor_configure_thresholds_mask(temp_sensor, 1, 1, + T_HOT, T_COLD); + mutex_unlock(&temp_sensor->sensor_mutex); + + return 0; + +hwmon_reg_err: + sysfs_remove_group(&temp_sensor->hwmon_dev->kobj, + &omap_temp_sensor_group); +sysfs_create_err: + free_irq(temp_sensor->irq, temp_sensor); +req_irq_err: + omap_temp_sensor_clk_disable(temp_sensor); +clken_err: + clk_put(temp_sensor->clock); + iounmap(temp_sensor->phy_base); +plat_res_err: + dev_set_drvdata(&pdev->dev, NULL); + mutex_destroy(&temp_sensor->sensor_mutex); + kfree(temp_sensor); + return ret; +} + +static int __devexit omap_temp_sensor_remove(struct platform_device *pdev) +{ + struct omap_temp_sensor *temp_sensor = platform_get_drvdata(pdev); + + hwmon_device_unregister(&pdev->dev); + sysfs_remove_group(&temp_sensor->hwmon_dev->kobj, + &omap_temp_sensor_group); + free_irq(temp_sensor->irq, temp_sensor); + omap_temp_sensor_clk_disable(temp_sensor); + clk_put(temp_sensor->clock); + iounmap(temp_sensor->phy_base); + dev_set_drvdata(&pdev->dev, NULL); + mutex_destroy(&temp_sensor->sensor_mutex); + kfree(temp_sensor); + + return 0; +} + +#ifdef CONFIG_PM +static void omap_temp_sensor_save_ctxt(struct omap_temp_sensor *temp_sensor) +{ + temp_sensor->temp_sensor_ctrl = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->temp_sensor_ctrl); + temp_sensor->bg_ctrl = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_mask_ctrl); + temp_sensor->bg_counter = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_counter); + temp_sensor->bg_threshold = omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->bgap_threshold); + temp_sensor->temp_sensor_tshut_threshold = + omap_temp_sensor_readl(temp_sensor, + temp_sensor->registers->thsut_threshold); +} + +static void omap_temp_sensor_restore_ctxt(struct omap_temp_sensor *temp_sensor) +{ + omap_temp_sensor_writel(temp_sensor, + temp_sensor->temp_sensor_ctrl, + temp_sensor->registers->temp_sensor_ctrl); + omap_temp_sensor_writel(temp_sensor, + temp_sensor->bg_ctrl, + temp_sensor->registers->bgap_mask_ctrl); + omap_temp_sensor_writel(temp_sensor, + temp_sensor->bg_counter, + temp_sensor->registers->bgap_counter); + omap_temp_sensor_writel(temp_sensor, + temp_sensor->bg_threshold, + temp_sensor->registers->bgap_threshold); + omap_temp_sensor_writel(temp_sensor, + temp_sensor->temp_sensor_tshut_threshold, + temp_sensor->registers->thsut_threshold); +} + +static int omap_temp_sensor_suspend(struct device *dev) +{ + struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev); + + omap_temp_sensor_save_ctxt(temp_sensor); + + return 0; +} + +static int omap_temp_sensor_resume(struct device *dev) +{ + struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev); + + omap_temp_sensor_restore_ctxt(temp_sensor); + + return 0; +} + +static int omap_temp_sensor_runtime_suspend(struct device *dev) +{ + struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev); + + omap_temp_sensor_save_ctxt(temp_sensor); + + return 0; +} + +static int omap_temp_sensor_runtime_resume(struct device *dev) +{ + static int context_loss_count; + int temp; + struct omap_temp_sensor *temp_sensor = dev_get_drvdata(dev); + + temp = omap_device_get_context_loss_count(to_platform_device(dev)); + + if (temp != context_loss_count && context_loss_count != 0) + omap_temp_sensor_restore_ctxt(temp_sensor); + + context_loss_count = temp; + + return 0; +} + +static int omap_temp_sensor_idle(struct device *dev) +{ + return 0; +} + +static const struct dev_pm_ops omap_temp_sensor_dev_pm_ops = { + SET_SYSTEM_SLEEP_PM_OPS(omap_temp_sensor_suspend, + omap_temp_sensor_resume) + SET_RUNTIME_PM_OPS(omap_temp_sensor_runtime_suspend, + omap_temp_sensor_runtime_resume, omap_temp_sensor_idle) +}; + +#define DEV_PM_OPS (&omap_temp_sensor_dev_pm_ops) +#else +#define DEV_PM_OPS NULL +#endif + +static struct platform_driver omap_temp_sensor_driver = { + .probe = omap_temp_sensor_probe, + .remove = omap_temp_sensor_remove, + .driver = { + .name = "omap_temp_sensor", + .pm = DEV_PM_OPS, + }, +}; + +int __init omap_temp_sensor_init(void) +{ + return platform_driver_register(&omap_temp_sensor_driver); +} +module_init(omap_temp_sensor_init); + +static void __exit omap_temp_sensor_exit(void) +{ + platform_driver_unregister(&omap_temp_sensor_driver); +} +module_exit(omap_temp_sensor_exit); + +MODULE_DESCRIPTION("OMAP446X temperature sensor Driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" DRIVER_NAME); +MODULE_AUTHOR("J Keerthy <j-keerthy@xxxxxx>"); -- 1.7.0.4 _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
